498 lines
15 KiB
Groff
498 lines
15 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Mon Feb 3 10:01:39 2003
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.\" ======================================================================
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.\"
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.IX Title "BIO_f_ssl 3"
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.TH BIO_f_ssl 3 "0.9.7" "2003-02-03" "OpenSSL"
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.UC
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.SH "NAME"
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BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes,
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BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl,
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BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id,
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BIO_ssl_shutdown \- \s-1SSL\s0 \s-1BIO\s0
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/bio.h>
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 1
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\& BIO_METHOD *BIO_f_ssl(void);
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.Ve
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.Vb 9
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\& #define BIO_set_ssl(b,ssl,c) BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)ssl)
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\& #define BIO_get_ssl(b,sslp) BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)sslp)
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\& #define BIO_set_ssl_mode(b,client) BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL)
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\& #define BIO_set_ssl_renegotiate_bytes(b,num) \e
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\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL);
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\& #define BIO_set_ssl_renegotiate_timeout(b,seconds) \e
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\& BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL);
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\& #define BIO_get_num_renegotiates(b) \e
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\& BIO_ctrl(b,BIO_C_SET_SSL_NUM_RENEGOTIATES,0,NULL);
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.Ve
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.Vb 5
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\& BIO *BIO_new_ssl(SSL_CTX *ctx,int client);
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\& BIO *BIO_new_ssl_connect(SSL_CTX *ctx);
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\& BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx);
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\& int BIO_ssl_copy_session_id(BIO *to,BIO *from);
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\& void BIO_ssl_shutdown(BIO *bio);
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.Ve
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.Vb 1
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\& #define BIO_do_handshake(b) BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL)
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_f_ssl()\fR returns the \s-1SSL\s0 \s-1BIO\s0 method. This is a filter \s-1BIO\s0 which
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is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to
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\&\s-1SSL\s0 I/O.
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.PP
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I/O performed on an \s-1SSL\s0 \s-1BIO\s0 communicates using the \s-1SSL\s0 protocol with
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the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established
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then an attempt is made to establish one on the first I/O call.
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.PP
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If a \s-1BIO\s0 is appended to an \s-1SSL\s0 \s-1BIO\s0 using \fIBIO_push()\fR it is automatically
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used as the \s-1SSL\s0 BIOs read and write BIOs.
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.PP
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Calling \fIBIO_reset()\fR on an \s-1SSL\s0 \s-1BIO\s0 closes down any current \s-1SSL\s0 connection
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by calling \fISSL_shutdown()\fR. \fIBIO_reset()\fR is then sent to the next \s-1BIO\s0 in
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the chain: this will typically disconnect the underlying transport.
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The \s-1SSL\s0 \s-1BIO\s0 is then reset to the initial accept or connect state.
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.PP
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If the close flag is set when an \s-1SSL\s0 \s-1BIO\s0 is freed then the internal
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\&\s-1SSL\s0 structure is also freed using \fISSL_free()\fR.
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.PP
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\&\fIBIO_set_ssl()\fR sets the internal \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR to \fBssl\fR using
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the close flag \fBc\fR.
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.PP
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\&\fIBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be
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manipulated using the standard \s-1SSL\s0 library functions.
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.PP
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\&\fIBIO_set_ssl_mode()\fR sets the \s-1SSL\s0 \s-1BIO\s0 mode to \fBclient\fR. If \fBclient\fR
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is 1 client mode is set. If \fBclient\fR is 0 server mode is set.
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.PP
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\&\fIBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count
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to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write)
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the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at
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least 512 bytes.
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.PP
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\&\fIBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to
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\&\fBseconds\fR. When the renegotiate timeout elapses the session is
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automatically renegotiated.
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.PP
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\&\fIBIO_get_num_renegotiates()\fR returns the total number of session
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renegotiations due to I/O or timeout.
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.PP
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\&\fIBIO_new_ssl()\fR allocates an \s-1SSL\s0 \s-1BIO\s0 using \s-1SSL_CTX\s0 \fBctx\fR and using
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client mode if \fBclient\fR is non zero.
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.PP
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\&\fIBIO_new_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting of an
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\&\s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) followed by a connect \s-1BIO\s0.
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.PP
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\&\fIBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting
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of a buffering \s-1BIO\s0, an \s-1SSL\s0 \s-1BIO\s0 (using \fBctx\fR) and a connect
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\&\s-1BIO\s0.
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.PP
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\&\fIBIO_ssl_copy_session_id()\fR copies an \s-1SSL\s0 session id between
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\&\s-1BIO\s0 chains \fBfrom\fR and \fBto\fR. It does this by locating the
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\&\s-1SSL\s0 BIOs in each chain and calling \fISSL_copy_session_id()\fR on
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the internal \s-1SSL\s0 pointer.
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.PP
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\&\fIBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0
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chain \fBbio\fR. It does this by locating the \s-1SSL\s0 \s-1BIO\s0 in the
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chain and calling \fISSL_shutdown()\fR on its internal \s-1SSL\s0
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pointer.
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.PP
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\&\fIBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the
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supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1
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if the connection was established successfully. A zero or negative
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value is returned if the connection could not be established, the
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call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs
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to determine if the call should be retried. If an \s-1SSL\s0 connection has
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already been established this call has no effect.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport
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is non blocking they can still request a retry in exceptional
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circumstances. Specifically this will happen if a session
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renegotiation takes place during a \fIBIO_read()\fR operation, one
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case where this happens is when \s-1SGC\s0 or step up occurs.
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.PP
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In OpenSSL 0.9.6 and later the \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be
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set to disable this behaviour. That is when this flag is set
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an \s-1SSL\s0 \s-1BIO\s0 using a blocking transport will never request a
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retry.
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.PP
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Since unknown \fIBIO_ctrl()\fR operations are sent through filter
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BIOs the servers name and port can be set using \fIBIO_set_host()\fR
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on the \s-1BIO\s0 returned by \fIBIO_new_ssl_connect()\fR without having
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to locate the connect \s-1BIO\s0 first.
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.PP
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Applications do not have to call \fIBIO_do_handshake()\fR but may wish
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to do so to separate the handshake process from other I/O
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processing.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\s-1TBA\s0
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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This \s-1SSL/TLS\s0 client example, attempts to retrieve a page from an
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\&\s-1SSL/TLS\s0 web server. The I/O routines are identical to those of the
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unencrypted example in BIO_s_connect(3).
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.PP
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.Vb 5
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\& BIO *sbio, *out;
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\& int len;
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\& char tmpbuf[1024];
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\& SSL_CTX *ctx;
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\& SSL *ssl;
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.Ve
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.Vb 3
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\& ERR_load_crypto_strings();
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\& ERR_load_SSL_strings();
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\& OpenSSL_add_all_algorithms();
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.Ve
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.Vb 3
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\& /* We would seed the PRNG here if the platform didn't
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\& * do it automatically
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\& */
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.Ve
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.Vb 1
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\& ctx = SSL_CTX_new(SSLv23_client_method());
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.Ve
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.Vb 4
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\& /* We'd normally set some stuff like the verify paths and
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\& * mode here because as things stand this will connect to
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\& * any server whose certificate is signed by any CA.
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\& */
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.Ve
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.Vb 1
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\& sbio = BIO_new_ssl_connect(ctx);
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.Ve
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.Vb 1
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\& BIO_get_ssl(sbio, &ssl);
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.Ve
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.Vb 4
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\& if(!ssl) {
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\& fprintf(stderr, "Can't locate SSL pointer\en");
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\& /* whatever ... */
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\& }
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.Ve
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.Vb 2
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\& /* Don't want any retries */
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\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
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.Ve
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.Vb 1
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\& /* We might want to do other things with ssl here */
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.Ve
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.Vb 1
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\& BIO_set_conn_hostname(sbio, "localhost:https");
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.Ve
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.Vb 6
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\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
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\& if(BIO_do_connect(sbio) <= 0) {
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\& fprintf(stderr, "Error connecting to server\en");
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\& ERR_print_errors_fp(stderr);
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\& /* whatever ... */
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\& }
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.Ve
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.Vb 5
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\& if(BIO_do_handshake(sbio) <= 0) {
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\& fprintf(stderr, "Error establishing SSL connection\en");
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\& ERR_print_errors_fp(stderr);
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\& /* whatever ... */
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\& }
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.Ve
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.Vb 1
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\& /* Could examine ssl here to get connection info */
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.Ve
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.Vb 8
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\& BIO_puts(sbio, "GET / HTTP/1.0\en\en");
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\& for(;;) {
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\& len = BIO_read(sbio, tmpbuf, 1024);
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\& if(len <= 0) break;
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\& BIO_write(out, tmpbuf, len);
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\& }
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\& BIO_free_all(sbio);
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\& BIO_free(out);
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.Ve
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Here is a simple server example. It makes use of a buffering
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\&\s-1BIO\s0 to allow lines to be read from the \s-1SSL\s0 \s-1BIO\s0 using BIO_gets.
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It creates a pseudo web page containing the actual request from
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a client and also echoes the request to standard output.
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.PP
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.Vb 5
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\& BIO *sbio, *bbio, *acpt, *out;
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\& int len;
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\& char tmpbuf[1024];
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\& SSL_CTX *ctx;
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\& SSL *ssl;
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.Ve
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.Vb 3
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\& ERR_load_crypto_strings();
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\& ERR_load_SSL_strings();
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\& OpenSSL_add_all_algorithms();
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.Ve
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.Vb 1
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\& /* Might seed PRNG here */
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.Ve
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.Vb 1
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\& ctx = SSL_CTX_new(SSLv23_server_method());
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.Ve
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.Vb 3
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\& if (!SSL_CTX_use_certificate_file(ctx,"server.pem",SSL_FILETYPE_PEM)
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\& || !SSL_CTX_use_PrivateKey_file(ctx,"server.pem",SSL_FILETYPE_PEM)
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\& || !SSL_CTX_check_private_key(ctx)) {
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.Ve
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.Vb 4
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\& fprintf(stderr, "Error setting up SSL_CTX\en");
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\& ERR_print_errors_fp(stderr);
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\& return 0;
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\& }
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.Ve
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.Vb 3
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\& /* Might do other things here like setting verify locations and
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\& * DH and/or RSA temporary key callbacks
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\& */
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.Ve
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.Vb 2
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\& /* New SSL BIO setup as server */
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\& sbio=BIO_new_ssl(ctx,0);
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.Ve
|
|
.Vb 1
|
|
\& BIO_get_ssl(sbio, &ssl);
|
|
.Ve
|
|
.Vb 4
|
|
\& if(!ssl) {
|
|
\& fprintf(stderr, "Can't locate SSL pointer\en");
|
|
\& /* whatever ... */
|
|
\& }
|
|
.Ve
|
|
.Vb 2
|
|
\& /* Don't want any retries */
|
|
\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
|
|
.Ve
|
|
.Vb 1
|
|
\& /* Create the buffering BIO */
|
|
.Ve
|
|
.Vb 1
|
|
\& bbio = BIO_new(BIO_f_buffer());
|
|
.Ve
|
|
.Vb 2
|
|
\& /* Add to chain */
|
|
\& sbio = BIO_push(bbio, sbio);
|
|
.Ve
|
|
.Vb 1
|
|
\& acpt=BIO_new_accept("4433");
|
|
.Ve
|
|
.Vb 5
|
|
\& /* By doing this when a new connection is established
|
|
\& * we automatically have sbio inserted into it. The
|
|
\& * BIO chain is now 'swallowed' by the accept BIO and
|
|
\& * will be freed when the accept BIO is freed.
|
|
\& */
|
|
.Ve
|
|
.Vb 1
|
|
\& BIO_set_accept_bios(acpt,sbio);
|
|
.Ve
|
|
.Vb 1
|
|
\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
|
|
.Ve
|
|
.Vb 6
|
|
\& /* Setup accept BIO */
|
|
\& if(BIO_do_accept(acpt) <= 0) {
|
|
\& fprintf(stderr, "Error setting up accept BIO\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& return 0;
|
|
\& }
|
|
.Ve
|
|
.Vb 6
|
|
\& /* Now wait for incoming connection */
|
|
\& if(BIO_do_accept(acpt) <= 0) {
|
|
\& fprintf(stderr, "Error in connection\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& return 0;
|
|
\& }
|
|
.Ve
|
|
.Vb 3
|
|
\& /* We only want one connection so remove and free
|
|
\& * accept BIO
|
|
\& */
|
|
.Ve
|
|
.Vb 1
|
|
\& sbio = BIO_pop(acpt);
|
|
.Ve
|
|
.Vb 1
|
|
\& BIO_free_all(acpt);
|
|
.Ve
|
|
.Vb 5
|
|
\& if(BIO_do_handshake(sbio) <= 0) {
|
|
\& fprintf(stderr, "Error in SSL handshake\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& return 0;
|
|
\& }
|
|
.Ve
|
|
.Vb 3
|
|
\& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent-type: text/html\er\en\er\en");
|
|
\& BIO_puts(sbio, "<pre>\er\enConnection Established\er\enRequest headers:\er\en");
|
|
\& BIO_puts(sbio, "--------------------------------------------------\er\en");
|
|
.Ve
|
|
.Vb 8
|
|
\& for(;;) {
|
|
\& len = BIO_gets(sbio, tmpbuf, 1024);
|
|
\& if(len <= 0) break;
|
|
\& BIO_write(sbio, tmpbuf, len);
|
|
\& BIO_write(out, tmpbuf, len);
|
|
\& /* Look for blank line signifying end of headers*/
|
|
\& if((tmpbuf[0] == '\er') || (tmpbuf[0] == '\en')) break;
|
|
\& }
|
|
.Ve
|
|
.Vb 2
|
|
\& BIO_puts(sbio, "--------------------------------------------------\er\en");
|
|
\& BIO_puts(sbio, "</pre>\er\en");
|
|
.Ve
|
|
.Vb 2
|
|
\& /* Since there is a buffering BIO present we had better flush it */
|
|
\& BIO_flush(sbio);
|
|
.Ve
|
|
.Vb 1
|
|
\& BIO_free_all(sbio);
|
|
.Ve
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\s-1TBA\s0
|